Lochinvar & A.O. Smith 100277747 Bearing Assembly

The Lochinvar & A.O. Smith 100277747 Bearing Assembly is a critical OEM component designed to restore structural integrity and whisper-quiet operation to high-efficiency commercial water heaters and boiler pumps. As the direct HVAC replacement part for legacy numbers ARM1046 and 100133571, this assembly is engineered to handle the high-torque demands of hydronic heating systems while mitigating shaft vibration. For technicians performing a circulator pump repair, this kit provides a precision-machined housing and high-grade internal bearings that reduce friction and heat buildup, effectively preventing motor shaft seizure and premature system failure. Utilizing a genuine Lochinvar bearing assembly ensures exact tolerances for internal clearances, maintaining the hydraulic peak efficiency required in demanding mechanical rooms. When the job calls for A.O. Smith repair parts, sticking with OEM specifications is the only way to ensure the long-term reliability and performance your clients expect from their heating infrastructure.

• Direct OEM Compatibility: Engineered as the exact replacement for ARM1046 and 100133571 to ensure drop-in fitment without field modifications.
• Reduced Mechanical Friction: High-performance internal bearings minimize rotational resistance, extending the service life of the boiler pump motor.
• Enhanced Vibration Dampening: Precision-balanced components reduce harmonic resonance, leading to quieter operation in multi-unit residential or commercial settings.
• Industrial-Grade Construction: Built to withstand the constant thermal cycling and high-pressure environments typical of Lochinvar boiler systems.

• Is this assembly compatible with Armstrong circulators? Yes, this unit is the direct manufacturer-authorized cross-reference for the ARM1046 bearing assembly commonly found in Armstrong-style pump configurations.
• What are the signs that my current bearing assembly needs replacement? Look for increased decibel levels (grinding or squealing), excessive heat at the motor bracket, or visible signs of leaking at the pump seal, which often stems from bearing play.
• Does this kit include the shaft and seals? This is a complete bearing assembly designed to provide the rotating support structure for the pump; always verify if your specific application requires a separate mechanical seal kit for a full overhaul.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.